I still see Malaysia still listed as a possibility for award tickets, just not in first class. Below is what I copied and pasted from NWA.com.

Has anyone done the JNB routing lately thru EZE with Malaysia?

Earning/Redeeming Miles
Earn miles on all Malaysia Airlines-operated flights with the exception of all domestic Malaysia flights, and flights booked in G, L, V or W class.
Redeem miles on all Malaysia Airlines-operated flights with the exception of flights between Australia and New Zealand. WorldPerks members may not redeem miles for First Class awards on Malaysia Airlines.

Destinations
Malaysia Airlines serves more than 110 destinations across six continents.

Web site: www.malaysiaairlines.com

Earning Banked Miles
100% of actual miles flown (500-mile minimum).
50% mileage bonus for purchased Business Class or First Class travel.
Domestic Malaysia flights or any flights booked in G, L, V or W classes are not eligible for mileage accrual.
Malaysia Airlines flights do not count towards Elite qualification.

Award Blackout Dates on Malaysia Airlines Flights
None
***WorldPerks members traveling on award tickets on Malaysia Airlines are subject to additional fees that include administrative fees, insurance and fuel surcharges. These fees will be collected by Malaysia Airlines upon check-in.